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Application programming interfaces for interaction
with and extension of the Eclipse Platform User Interface.
<h2>Package Specification</h2>
This package provides application programming interfaces for interaction
with activities.  Activities are objects that may be enabled or disabled and 
contain bindings to various regular expressions.  Activities are used by the 
workbench to filter selected contributions from the users view untill such a 
time that they express interest in using them.
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